only allow posting by specific group

git-svn-id: svn+ssh://organicdesign.co.nz/extensions@1938 2ad5491c-c162-49ae-9d3b-afa169216a3e
only allow posting by specific group

git-svn-id: svn+ssh://organicdesign.co.nz/extensions@1939 2ad5491c-c162-49ae-9d3b-afa169216a3e
change name from Node to NodeDtree

git-svn-id: svn+ssh://organicdesign.co.nz/extensions@1940 2ad5491c-c162-49ae-9d3b-afa169216a3e